Login screen only shows guest user account, but not my admin account

Accidentally deleted Admin account

You can create a new administrator account by restarting the Apple Setup.

Even though this Setup Assistant only runs once when you first install Mac OS X / macOS, it remains on your computer and is prevented from running by the presences of a hidden file called <.AppleSetupDone> in a system folder on your Mac.

Therefore, to have the Setup Assistant run again so you can create a fresh admin account, you simply need to remove this file

1. Boot into Single User Mode: Start/restart your Mac. As soon as you hear the startup tone, press and hold ⌘ + S
2. until you see a black screen with white lettering. (If you end up back
3. on the login screen after a flash of the black screen with white
4. lettering, enter your password and it will return to the black screen.)
5. Check and repair the drive by typing /sbin/fsck -fy then ↩ enter - as directed by the on-screen text.
6. Mount the drive as read-write by typing /sbin/mount -uw / then ↩ enter.
7. Remove the Apple Setup Done file by typing
8. rm /var/db/.AppleSetupDone then ↩ enter.
9. Reboot by typing reboot then ↩ enter.
10. Complete the setup process, creating a new admin account.

Accidentally deleted the admin user

ref: https://apple.stackexchange.com/questions/164331/i-dont-have-administrator-account-on-my-mac

ref: How To Recover Lost Admin Rights On macOS High Sierra and Sierra, Mac OS X El Capitan And Yosemite - miapple.me

Well, I just bit the bullet and restored my internal HD from my last CCC backup. Everything is back to normal now . . . I hope. :)

Good computing WordWeaver777 !

Think about turning on Time Machine going forward, it could not be easier—one benefit is the local snapshots.

How to use Time Machine to back up or restore your Mac: https://support.apple.com/en-us/HT201250

Boot clone https://discussions.apple.com/docs/DOC-10081

Your Information is still there and it's still recoverable. However the only problem is you'll need a new admin account to get it.

If you create a new admin account using terminal then log into that account, you'll then want to create 1 more admin account with the as the home folder as your previous user account. You should be able to relog into that same account with all your information afterwards.

I would recommend calling Apple Support to walk you through the steps to be honest.

https://support.apple.com/en-us/HT201232

Simplest way forward would be to clone back to your hardrive (basically restoring the entire drive.)

If you have a current Time Machine backup you may be able to cover more recent files, not on the CCC.

I chose to reinstall Mojave 10.14.3.

if I look in the "Users" folder, my home folder -- and all of its data -- is still there.

but I wasn't sure if I should go that route.

You must of had admin privileges to re- install the macOS

a 24 hr old CCC backup is a very good back to restore everything as it was—doesn't get any better than that.

Yes If the home folder is still there, than it is still there.

I thought the problem is you do not have admin access to that account ?

Do you see your admin account in the >Log-in

You have your options. Good luck.

Sometimes the user account can get corrupted.

I would recommend restoring from backup if you have one otherwise the alternative involves terminal and creating another admin account.